#include <stdio.h>
#include <string.h> /* strcat()函数的原型在该头文件中 */
#define SIZE 80
char * s_gets(char * st, int n);

int main(void)
{ 
char flower[SIZE];
char addon [] = "s smell like old shoes.";
puts("What is your favorite flower?");
if (s_gets(flower, SIZE))
{ 
strcat(flower, addon);
puts(flower);
puts(addon);
} 
else
puts("End of file encountered!");
puts("bye");
return 0;
} 

char * s_gets(char * st, int n)
{ 
char * ret_val;
int i = 0;
ret_val = fgets(st, n, stdin);
if (ret_val)
{
while (st[i] != '\n' && st[i] != '\0')
i++;
if (st[i] == '\n')
st[i] = '\0';
else
while (getchar() != '\n')
continue;
} 
return ret_val;
}